source/texture3d.cpp

   1 #include <cmath>
   2 #include <msp/gl/extensions/ext_texture3d.h>
   3 #include <msp/graphics/image.h>
   4 #include "bindable.h"
   5 #include "error.h"
   6 #include "pixelstore.h"
   7 #include "texture3d.h"
   8
   9 using namespace std;
  10
  11 namespace Msp {
  12 namespace GL {
  13
  14 Texture3D::Texture3D(GLenum t):
  15         Texture(t),
  16         ifmt(RGB),
  17         width(0),
  18         height(0),
  19         depth(0),
  20         allocated(0)
  21 { }
  22
  23 Texture3D::Texture3D():
  24         Texture(GL_TEXTURE_3D),
  25         ifmt(RGB),
  26         width(0),
  27         height(0),
  28         depth(0),
  29         allocated(0)
  30 {
  31         static Require _req(EXT_texture3D);
  32 }
  33
  34 void Texture3D::storage(PixelFormat fmt, unsigned wd, unsigned ht, unsigned dp)
  35 {
  36         if(width>0)
  37                 throw invalid_operation("Texture3D::storage");
  38         if(wd==0 || ht==0 || dp==0)
  39                 throw invalid_argument("Texture3D::storage");
  40         require_pixelformat(fmt);
  41
  42         width = wd;
  43         height = ht;
  44         depth = dp;
  45         ifmt = fmt;
  46 }
  47
  48 void Texture3D::allocate(unsigned level)
  49 {
  50         if(allocated&(1<<level))
  51                 return;
  52
  53         PixelFormat base_fmt = get_base_pixelformat(ifmt);
  54         image(level, base_fmt, get_alloc_type(base_fmt), 0);
  55 }
  56
  57 void Texture3D::image(unsigned level, PixelFormat fmt, DataType type, const void *data)
  58 {
  59         if(width==0 || height==0 || depth==0)
  60                 throw invalid_operation("Texture3D::image");
  61
  62         unsigned w = width;
  63         unsigned h = height;
  64         unsigned d = depth;
  65         get_level_size(level, w, h, d);
  66
  67         BindRestore _bind(this);
  68         glTexImage3D(target, level, ifmt, width, height, depth, 0, fmt, type, data);
  69
  70         allocated |= 1<<level;
  71         if(gen_mipmap && level==0)
  72         {
  73                 auto_generate_mipmap();
  74                 for(; (w || h || d); w>>=1, h>>=1, d>>=1, ++level) ;
  75                 allocated |= (1<<level)-1;
  76         }
  77 }
  78
  79 void Texture3D::sub_image(unsigned level, int x, int y, int z, unsigned wd, unsigned ht, unsigned dp, PixelFormat fmt, DataType type, const void *data)
  80 {
  81         if(width==0 || height==0 || depth==0)
  82                 throw invalid_operation("Texture3D::image");
  83
  84         allocate(level);
  85
  86         BindRestore _bind(this);
  87         glTexSubImage3D(target, level, x, y, z, wd, ht, dp, fmt, type, data);
  88 }
  89
  90 void Texture3D::load_image(const string &fn, int dp)
  91 {
  92         Graphics::Image img;
  93         img.load_file(fn);
  94
  95         unsigned w = img.get_width();
  96         unsigned h = img.get_height();
  97         unsigned d = 1;
  98
  99         if(dp==-1)
 100         {
 101                 if(h%w)
 102                         throw incompatible_data("Texture3D::load_image");
 103                 d = h/w;
 104                 h = w;
 105         }
 106         else if(dp==-2)
 107         {
 108                 for(d=h; d*d>h; d>>=2) ;
 109                 for(; d*d<h; ++d) ;
 110                 if(d*d!=h)
 111                         throw incompatible_data("Texture3D::load_image");
 112                 h = d;
 113         }
 114         else if(dp>0)
 115         {
 116                 d = dp;
 117                 if(h%d)
 118                         throw incompatible_data("Texture3D::load_image");
 119                 h /= d;
 120         }
 121         else
 122                 throw invalid_argument("Texture3D::load_image");
 123
 124         PixelFormat fmt = pixelformat_from_graphics(img.get_format());
 125         if(width==0)
 126                 storage(storage_pixelformat_from_graphics(img.get_format()), w, h, d);
 127         else if(w!=width || h!=height || d!=depth)
 128                 throw incompatible_data("Texture3D::load_image");
 129
 130         PixelStore pstore = PixelStore::from_image(img);
 131         BindRestore _bind_ps(pstore);
 132
 133         image(0, fmt, UNSIGNED_BYTE, img.get_data());
 134 }
 135
 136 void Texture3D::image(const Graphics::Image &img, bool srgb)
 137 {
 138         unsigned w = img.get_width();
 139         unsigned h = img.get_height();
 140         unsigned d = 1;
 141
 142         if(depth)
 143         {
 144                 if(h%depth)
 145                         throw incompatible_data("Texture3D::load_image");
 146                 h /= depth;
 147                 d = depth;
 148         }
 149         else
 150         {
 151                 if(h%w)
 152                         throw incompatible_data("Texture3D::load_image");
 153                 d = h/w;
 154                 h = w;
 155         }
 156
 157         PixelFormat fmt = pixelformat_from_graphics(img.get_format());
 158         if(width==0)
 159                 storage(storage_pixelformat_from_graphics(img.get_format(), srgb), w, h, d);
 160         else if(w!=width || h!=height || d!=depth)
 161                 throw incompatible_data("Texture3D::load_image");
 162
 163         PixelStore pstore = PixelStore::from_image(img);
 164         BindRestore _bind_ps(pstore);
 165
 166         image(0, fmt, UNSIGNED_BYTE, img.get_data());
 167 }
 168
 169 void Texture3D::get_level_size(unsigned level, unsigned &w, unsigned &h, unsigned &d)
 170 {
 171         w >>= level;
 172         h >>= level;
 173         if(target!=GL_TEXTURE_2D_ARRAY)
 174                 d >>= level;
 175
 176         if(!w && (h || d))
 177                 w = 1;
 178         if(!h && (w || d))
 179                 h = 1;
 180         if(!d && (w || h))
 181                 d = 1;
 182 }
 183
 184 UInt64 Texture3D::get_data_size() const
 185 {
 186         return id ? width*height*depth*get_pixel_size(ifmt) : 0;
 187 }
 188
 189
 190 Texture3D::Loader::Loader(Texture3D &t):
 191         DataFile::DerivedObjectLoader<Texture3D, Texture::Loader>(t)
 192 {
 193         init();
 194 }
 195
 196 Texture3D::Loader::Loader(Texture3D &t, Collection &c):
 197         DataFile::DerivedObjectLoader<Texture3D, Texture::Loader>(t, c)
 198 {
 199         init();
 200 }
 201
 202 void Texture3D::Loader::init()
 203 {
 204         add("raw_data", &Loader::raw_data);
 205         add("storage", &Loader::storage);
 206 }
 207
 208 void Texture3D::Loader::raw_data(const string &data)
 209 {
 210         obj.image(0, get_base_pixelformat(obj.ifmt), UNSIGNED_BYTE, data.data());
 211 }
 212
 213 void Texture3D::Loader::storage(PixelFormat fmt, unsigned w, unsigned h, unsigned d)
 214 {
 215         if(srgb)
 216                 fmt = get_srgb_pixelformat(fmt);
 217         obj.storage(fmt, w, h, d);
 218 }
 219
 220 } // namespace GL
 221 } // namespace Msp